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Q4. The shell of a steam condenser has a volume of 10 m³ and contains dry saturated steam and air. At a particular instant the vacuum gauge reads 660 mm of mercury and the internal temperature is 38℃ .

After a period of time the temperature has fallen to 26.7℃ and the vacuum gauge reads 560 mm of mercury. The atmospheric pressure remains constant 1014 mbar.

Calculate EACH of the following:

(a) The initial mass of air present;(5)

(b) The initial mass of dry saturated vapour;(2)

(c) The mass of air that has leaked into the condenser;(5)

(d) The mass of vapour condensed. (4)

Note: For mercury ρ = 13600  kg⁄m³

For air R = 287 J/kg K.